<!DOCTYPE html>
<html lang = "en" >
<head >
  <meta charset = "UTF-8" >
  <title >Title</title >
    {% block extcss %}
    {% endblock %}
</head >
<body >
<h2>父亲</h2>
<li>
 <li>ahahahah </li>
</li>

    {% block head %}
    {% endblock %}

    {% block content %}
    {% endblock %}

    {% block foot %}
    {% endblock %}


{# js #}
    {% block extjs %}
    {% endblock %}
</body >
</html >